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- UNITED STATES PATENT OFFICE.

ANTHONY Y. EASTERBY, OF NAIA, CALIFORNIA, ASSIGNOR TO CALIFORNIA PORTLAND CEMENT COMPANY.

HYDRAULIC CEMENT.

SPECIFICATION forming part of Letters Patent No. 230,865, dated August 10, 1880.

Application filed May 6,1880. (Specimen) To all whom it may concern Be it known that I, ANTHONY YOUNG EAST- ERBY, of Napa city, in the county of Napa and State of California, have invented a Hydraulio Cement, of which the following is a specification.

My invention or discovery consists in the employment of a substance termed travertinea light-brown concretionary limestone,

usually hard and semi-crystalline, never before employed for this purpose. This I employ, together with aluminous silica, in the following proportions, viz: travertine, from seventy-five (75) to eighty (80) per cent.; alnminous silica,

from twenty to twenty-five ().per cent.

These suhstances'are pulverizedin a dry state by means of a centrifugal pulverizer, and so as to thoroughly incorporate the powdered substances. After the travertine and aluminous 2o clay are finely ground the product is to be thoroughly and intimately mixed with sufficient hot water to a plastic state of about the consistency of clay for making urick. It is then to be formed into cylinders of about three 25 (3) inches in diameter and cut into lengths of about foundi) inches and set aside for drying either by natural or artificial heat.

The operation of water mixing and forming the compound into cylinders may be performed 0 by any suitable mixing-machine, and be provided with a molding aperture or former, which will deliver the mixed compound in form of a continuous hollow cylinder, which is out off in lengths required as it comes from the ma 3 5 chine. The'sun or artificially dried cylinders are then to be placed in a kiln or furnace and brought to a white heat. Care should be taken, however, not to vitrify the cylindrical bricks, as this would impair rather than add to the strength of the cement. 4o

WVhen the kiln is sufliciently cooled the bricks are removed therefrom, broken up. and ground in the ordinary manner in which burned hydraulic limestone is treated for hydraulic cement, the ground material constituting the powder of artificial hydraulic cement.

The method of my process does not differ materially from the common methods adopted for the manufacture of artificial hydraulic cements, and hence I do not desire to make claim to any of the mechanical operations herein set forth.

Having thus described my invention, what 1 claim, and desire to secure by Letters Patent,

1. The use of travertine for the manufacture and production of hydraulic cement, substantiall y as herein set forth and specified.

2. In the manufacture of hydraulic cement, the compound herein described, consisting of travertine and aluminous clay or silica, in about the proportions herein set forth and specified.

In testimony that I claim the foregoing I have hereunto set my hand and seal this 20th day of April, 1880.

ANTHONY Y. EASTERBY.

Witnesses:

O. W. M. SMITH, HOLLAND SMITH. 

